diff --git a/.travis.yml b/.travis.yml
index 472c89f..6f1aaee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,12 +11,17 @@
 # Travis CI Documentation
 #   (https://docs.travis-ci.com)
 language: node_js
+dist: trusty
+sudo: false
 node_js:
+  - "4"
   - "6"
-cache:
- directories:
-    - $HOME/node_modules
+  - "7"
+before_install:
+  - rm -rf ./node_modules
 before_script:
-  - npm install -g gulp
+  - npm install -g gulp-cli
+  - npm install gulp
   - npm install
-script: gulp lint
+script:
+  - gulp --harmony lint
diff --git a/circle.yml b/circle.yml
index 8bc3da2..820156d 100644
--- a/circle.yml
+++ b/circle.yml
@@ -9,14 +9,20 @@
 #
 # [References]
 # Circle CI
-#   (https://circleci.com/docs)
+#   https://circleci.com/docs
+machine:
+  environment:
+    PATH: "${PATH}:${HOME}/${CIRCLE_PROJECT_REPONAME}/node_modules/.bin"
 machine:
   node:
-    version: 6.1.0
+    version: 7
 dependencies:
+  pre:
+    - rm -rf ./node_modules
   override:
-    - npm install -g gulp
+    - npm install -g gulp-cli
+    - npm install gulp
     - npm install
 test:
   override:
-    - gulp lint
+    - gulp --harmony lint